My most favourite YouTube player usability WTF was keyboard play state toggling with focused play/pause button. It is actually fixed at this point, but for a v

My most favourite YouTube player usability WTF was keyboard play state toggling with focused play/pause button. It is actually fixed at this point, but for a very long time there was a 'collision' (respective parallel processing) of the page-wide space-bar handler that toggles playback and the actual "click" event handler of the play/pause button that can be triggered with the space key as well. As a result, if you started play by clicking the play button under seeker (focussing it in effect) and later decided to pause the video by pressing the space-bar, it briefly paused the video (play->pause from the button click handler) and immediately triggered pause->play from the global handler (or other way round). So to actually pause the video with keyboard you had to shift-tab away from the invisibly-focussed (!) play button to the seeker and only then used the space key to trigger the global handler alone. It always left me flabbergasted how such blatant UX flaw could remain unattended in such prominent service for that long.